updated 15 April 2014
The BIS effective exchange rate (EER) indices now cover 61 economies (including individual euro area countries and, separately, the euro area as an entity). The most recent weights are based on trade in 2008-10 and the indices' base year is 2010.
Two basket compositions are available:
Nominal EERs are calculated as geometric weighted averages of bilateral exchange rates. Real EERs are the same weighted averages of bilateral exchange rates adjusted by relative consumer prices. The weighting pattern is time-varying, and the most recent weights are based on trade in 2008-10 (see broad and narrow weights). The EER indices are available as monthly averages.
For an explanation of the methodology behind the BIS EER indices, see:
The monthly effective exchange rate data will be released mid-month on a monthly basis.